diff --git a/Libraries/LibJS/Bytecode/Interpreter.cpp b/Libraries/LibJS/Bytecode/Interpreter.cpp
index 90ba480f392..a915d7b041d 100644
--- a/Libraries/LibJS/Bytecode/Interpreter.cpp
+++ b/Libraries/LibJS/Bytecode/Interpreter.cpp
@@ -103,7 +103,7 @@ static ByteString format_operand(StringView name, Operand operand, Bytecode::Exe
         else if (value.is_double())
             builder.appendff("Double({})", value.as_double());
         else if (value.is_bigint())
-            builder.appendff("BigInt({})", value.as_bigint().to_byte_string());
+            builder.appendff("BigInt({})", MUST(value.as_bigint().to_string()));
         else if (value.is_string())
             builder.appendff("String(\"{}\")", value.as_string().utf8_string_view());
         else if (value.is_undefined())
diff --git a/Libraries/LibJS/Runtime/BigInt.cpp b/Libraries/LibJS/Runtime/BigInt.cpp
index c467f9c0135..47da5240c8b 100644
--- a/Libraries/LibJS/Runtime/BigInt.cpp
+++ b/Libraries/LibJS/Runtime/BigInt.cpp
@@ -28,6 +28,11 @@ ErrorOr<String> BigInt::to_string() const
     return String::formatted("{}n", TRY(m_big_integer.to_base(10)));
 }
 
+Utf16String BigInt::to_utf16_string() const
+{
+    return Utf16String::formatted("{}n", MUST(m_big_integer.to_base(10)));
+}
+
 // 21.2.1.1.1 NumberToBigInt ( number ), https://tc39.es/ecma262/#sec-numbertobigint
 ThrowCompletionOr<GC::Ref<BigInt>> number_to_bigint(VM& vm, Value number)
 {
diff --git a/Libraries/LibJS/Runtime/BigInt.h b/Libraries/LibJS/Runtime/BigInt.h
index cd65bfcabd3..1409d352f05 100644
--- a/Libraries/LibJS/Runtime/BigInt.h
+++ b/Libraries/LibJS/Runtime/BigInt.h
@@ -28,7 +28,7 @@ public:
     Crypto::SignedBigInteger const& big_integer() const { return m_big_integer; }
 
     ErrorOr<String> to_string() const;
-    ByteString to_byte_string() const { return ByteString::formatted("{}n", MUST(m_big_integer.to_base(10))); }
+    Utf16String to_utf16_string() const;
 
 private:
     explicit BigInt(Crypto::SignedBigInteger);